Multiple form use validate，but the first one can useful

[unknown-kk]

As the title，i have 3 form has class ajax_form , $(".ajax_form").validate({...}) but the first one work ,others not

[DiegoLopesLima]

There may be a particularity in your case. But you can try to fix this problem using the jQuery.fn.each method:

$('.ajax_form').each({

    $(this).validate(/* {...} */);

});